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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 00 QCheatnut Street Taor nI January 27, 1983 IBDM50-390/83-.02 WBD-50-391/83-02 U.S. Nuolear Regulatory Commissioe Region I ro Attn: -l. James P. O'Reilly, Regional Administrator 101 Mariett Street, Suite 3100 Atlanta, Georgia 30303 Dear Wr. O'Reilly: IMITS BAR NUCLEAR PLANT UNITS 1 AND 2 - AUXLIAR Y INJSTR)JA ROK- IR n OOR FAILoRM - tD-50390/83-0o, URD-50-391/83.02 - FIrST INTERM REPORT The subJet deloienoy us initially reported to NRC-OIB Insieotor R. V. Crienjak on December 29, 1982 in aoordanoe with 10 CPR 50.55(e) as NCR N x 820o Enlod i r o or first interim report. We expot to submit our next report ; or about Hay 20, 1983. If you le any question, please get in touch with R. B . Shell at FTS 858-2688. Very truly yours, TBWSSRB VALLEY AUTHIRITY Le M. N. illsr Nuolear Licenaing BEnlosure oo: r. Richard C. DeToung, Direotor (Bnolosure) Office of Inspectio and nforcemant U.S. Nuclear Regulatory Comission Washl•gton, D.C. 20555 An Equja OPDlotunlty Lmnulo-vet

TENNESSEE VALLEY AUTHORITYTENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 00 QCheatnut Street Taor nI January 27, 1983 IBDM50-390/83-.02 WBD-50-391/83-02 U.S. Nuolear Regulatory

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Page 1: TENNESSEE VALLEY AUTHORITYTENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 00 QCheatnut Street Taor nI January 27, 1983 IBDM50-390/83-.02 WBD-50-391/83-02 U.S. Nuolear Regulatory

TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401

00 QCheatnut Street Taor nI

January 27, 1983 IBDM50-390/83-.02

WBD-50-391/83-02

U.S. Nuolear Regulatory Commissioe Region I ro Attn: -l. James P. O'Reilly, Regional Administrator 101 Mariett Street, Suite 3100 Atlanta, Georgia 30303

Dear Wr. O'Reilly:

IMITS BAR NUCLEAR PLANT UNITS 1 AND 2 - AUXLIAR Y INJSTR)JA ROK- IR n OOR FAILoRM - tD-50390/83-0o, URD-50-391/83.02 - FIrST INTERM REPORT

The subJet deloienoy us initially reported to NRC-OIB Insieotor R. V. Crienjak on December 29, 1982 in aoordanoe with 10 CPR 50.55(e) as NCR N x 820o Enlod i r o or first interim report. We expot to submit our next report ; or about Hay 20, 1983.

If you le any question, please get in touch with R. B. Shell at FTS 858-2688.

Very truly yours,

TBWSSRB VALLEY AUTHIRITY

Le M. N. illsr Nuolear Licenaing

BEnlosure oo: r. Richard C. DeToung, Direotor (Bnolosure)

Office of Inspectio and nforcemant U.S. Nuclear Regulatory Comission Washl•gton, D.C. 20555

An Equja OPDlotunlty Lmnulo-vet

Page 2: TENNESSEE VALLEY AUTHORITYTENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 37401 00 QCheatnut Street Taor nI January 27, 1983 IBDM50-390/83-.02 WBD-50-391/83-02 U.S. Nuolear Regulatory

ATrZ BAR ZW P aWITS 1 AND 2 AOUXLIar IIST U Nr M OON FIR DOOR FAILOUE 10 CFR 50.55(e)

BRD-50-390/83-02, IBBD-50-391/83-02 ica - m 8207 .NrST zVmBm E

Deoription of Defitieny

The double fire orea (C24) at -the vt d of tn uit 2 auiliary strun rom an oontrol bulding eletton 713.0 tailed du ring CO treS M ti O t o trti tet o c prt atpnoptoa test/VA-35A. The doors, whih were deignea to open itoa the rO, were blown outward, hing. were beat, hige screws Mres heared, and the dor fae wa baut and separated from the ula. The failur u 00curred jut oprior to the ad -o a timd CO4 diarehr an the rom proessure bad e obed appromately 12 ino ot water atd Aen tbh COn conoetratonbaerd reached 52 pat. BTh te sooeptance critria or i con~ s trtion us 50 pasront. dentical doors did not fl during a concentraton tet conduted In the unit 1 auxiliary instrummt room. No dage baa reaulted ftre om..preasuri.tion in previous CO2 system teats in other areas at Vatts Bar and at-- other TIA nuclear Plants except a noted in sequoyah Nuclear Plant rno00ottoganc •- report 3=.79W2 (dated December. 5, ,1979) This exception involved a structural defloiecy that us peculiar to Sequoyah.

Altbough rMOm Pressure Was Monitored during the concentration teats, o acceptance riteria or the prensure a speoified in the preoperatiocal teat inatruotion. Such criteria were omitted since the personnel establishing the preoperatinal test requireuMtu did not eQct ron Pressurea during the concentration teit that would r•sult in any rtruotural da.ma .

interim ProMres

TVA is ourrently evaluating the door failure an the pressure liiting structu-l elmnts associated with doors, walls, and ventiliation ducting in all 002 prototed areas at Vatts Bar. Before continuing the CO concentration teat at Vatts Bar, acceptanc criteria wil be eatablished for maiMau allwable room prsures and Procedures will be established for stoppingl a test before these pressures we exo•eded,